GNC women are women (females), and GC feminism is all about supporting them and abolishing gender alltogether, so any woman can be anyhow she wants, instead of putting women into "gender boxes" and expecting women to look and act in a particular way, and if women don't act like that - then "they are something else but women, non-binaries or transmen". That is one of main points of Gender Critical Feminism, to abolish those gender stereotypes, so women are always women and not some set of stereotypes. Second point of GCF is that transwomen are still males, and that changing sex-based protections and rights into gender-based protections and rights is just wrong, because women as a class becoming defenseless and abusing women (especially GNC women) is no longer against the law. So all female rights and protections for which feminists were fighting hundreds of years are not revoked. Especially in a world where in many countries women still have no rights and are "men's property" by the law in those countries.

And as it was said above - it is not debate sub, but there is one for debating.